Papers by Arturo Gabriel Espinoza Garcia
The probabilistic clustering techniques can be applied to generate fuzzy sets in situations where... more The probabilistic clustering techniques can be applied to generate fuzzy sets in situations where there is little or no information about data. Quite often, they generate a huge number of clusters. These clusters can be interpreted as fuzzy sets in a process of building a fuzzy system. A large number of fuzzy sets introduce noise to the fuzzy system, hence the need to reduce their number. Fuzzy Similarity Measures (FSMs) are widely used for comparison of fuzzy sets. Multiple FSMs have been proposed so far, but identifying a single FSM that is the most suitable for a given task is not always a straightforward process. On many occasions, FSMs are used to reduce a number of fuzzy sets. In this paper, we present the results of analyzing suitability of FSMs to reduce number of fuzzy sets and fuzzy if-then rules for an image segmentation problem. We use a PG-Means algorithm to generate fuzzy sets on both input and output variables. We propose and apply algorithms utilizing FSMs to reduce ...
In order to characterize the epistemological models of medical sciences of use in medical trainin... more In order to characterize the epistemological models of medical sciences of use in medical training, the study was carried out from the field of philosophical hermeneutics. From the analysis of documentary sources a horizon of understanding of the historical evolution of the theoretical models of medical sciences is constructed. Recovering the study of Antonio Arredondo, 11 explanatory models of the health-disease process are identified, which are grouped into 6 epistemological models: deterministic, animistic, ecological triad, risk approach, sociocultural approach, systemic approach. Two fundamental aspects stand out in relation to medical education: the conception of the ontological, epidemiological and healthcare dimension of the disease; and the application of the principle of causality to the genesis and evolution of the disease. It is concluded that the dimensions of the disease and the causal relationship are the axes to support the model of the natural and social history of ...
The avoidance of sickness and the extension of life, however, the non compliment of these aspirat... more The avoidance of sickness and the extension of life, however, the non compliment of these aspirations make the patient disappointed towards medical technologies. With the purpose to promote reflexion over the humanistic content over this medical technology, the article point of departure exposes the technical and scientifically domain of medicine as a base for the tension between the scientific knowledge of doctors and the existential knowledge of patients, in order to establish horizons of comprehension which unmask the forgetfulness of health as the structural element that allow him/her to locate in the disappointment of medical technology , which is in conclusion, a way to understand the world manifesting the lack of a life project humanly thought , historically allocated and morally assumed
Diabetes technology & therapeutics, Jan 11, 2017
High levels of glycemic variability are still observed in most patients with diabetes with severe... more High levels of glycemic variability are still observed in most patients with diabetes with severe insulin deficiency. Glycemic variability may be an important risk factor for acute and chronic complications. Despite its clinical importance, there is no consensus on the optimum method for characterizing glycemic variability. We developed a simple new metric, the glycemic variability percentage (GVP), to assess glycemic variability by analyzing the length of the continuous glucose monitoring (CGM) temporal trace normalized to the duration under evaluation. The GVP is similar to other recently proposed glycemic variability metrics, the distance traveled, and the mean absolute glucose (MAG) change. We compared results from distance traveled, MAG, GVP, standard deviation (SD), and coefficient of variation (CV) applied to simulated CGM traces accentuating the difference between amplitude and frequency of oscillations. The GVP metric was also applied to data from clinical studies for the D...
Diabetes technology & therapeutics, Jun 1, 2017
The potential clinical benefits of continuous glucose monitoring (CGM) have been recognized for m... more The potential clinical benefits of continuous glucose monitoring (CGM) have been recognized for many years, but CGM is used by a small fraction of patients with diabetes. One obstacle to greater use of the technology is the lack of simplified tools for assessing glycemic control from CGM data without complicated visual displays of data. We developed a simple new metric, the personal glycemic state (PGS), to assess glycemic control solely from continuous glucose monitoring data. PGS is a composite index that assesses four domains of glycemic control: mean glucose, glycemic variability, time in range and frequency and severity of hypoglycemia. The metric was applied to data from six clinical studies for the G4 Platinum continuous glucose monitoring system (Dexcom, San Diego, CA). The PGS was also applied to data from a study of artificial pancreas comparing results from open loop and closed loop in adolescents and in adults. The new metric for glycemic control, PGS, was able to charac...
2016 Annual Conference of the North American Fuzzy Information Processing Society (NAFIPS), 2016
Fuzzy Similarity Measures (FSMs) are widely used for comparison of fuzzy sets, as well as fuzzy r... more Fuzzy Similarity Measures (FSMs) are widely used for comparison of fuzzy sets, as well as fuzzy rules. A multitude of different FSMs have been proposed so far. It is not straightforward to identify a single FSM that is the most suitable for a given task. In this paper, we investigate suitability of a few FSMs for the problem of reduction of number of rules for an image segmentation process. We use Dirichlet-based approach to generate fuzzy sets that are further used for construction of fuzzy if-then rules. We analyze similarity of these rules and select a specified number of rules for image segmentation purposes. We applied this approach to two different images.
Computer-Aided Design of User Interfaces VI, 2009
Space deserves a special attention when designing 3D user interfaces. However, many proposed meth... more Space deserves a special attention when designing 3D user interfaces. However, many proposed methods rely on simple sketches and/or maps. Besides, those methods usually leave aside the 2D interfaces that may be found in the 3D environment or that surround it. This chapter presents an attempt to formalize 2D and 3D spaces by the definition of a meta-model. This is one of three meta-models that have been defined in three-dimensional user interface development methodology, which is also described here along with some case studies, focusing the description on space. V. López-Jaquero et al. (eds.
2014 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE), 2014
ABSTRACT
Pattern Recognition Letters, 2006
In this paper, we present a circle detection method based on genetic algorithms. Our genetic algo... more In this paper, we present a circle detection method based on genetic algorithms. Our genetic algorithm uses the encoding of three edge points as the chromosome of candidate circles (x, y, r) in the edge image of the scene. Fitness function evaluates if these candidate circles are really present in the edge image. Our encoding scheme reduces the search space by avoiding trying unfeasible individuals, this results in a fast circle detector. Our approach detects circles with sub-pixellic accuracy on synthetic images. Our method can also detect circles on natural images with sub-pixellic precision. Partially occluded circles can be located in both synthetic and natural images. Examples of the application of our method to the recognition of hand-drawn circles are also shown. Detection of several circles in a single image is also handled by our method.
HCI International, 2005
This paper describes the development of an e-commerce Web site based on a virtual world that repl... more This paper describes the development of an e-commerce Web site based on a virtual world that replicates a real store in order to offer a more familiar interface to the user, but overcoming the problems of reality offering a customized presentation of items to each ...
Surgery, 2014
Papillary thyroid carcinoma (PTC) with BRAF mutation carries a poorer prognosis. Prophylactic cen... more Papillary thyroid carcinoma (PTC) with BRAF mutation carries a poorer prognosis. Prophylactic central neck dissection (CND) reduces locoregional recurrences, and we hypothesize that initial total thyroidectomy (TT) with CND in patients with BRAF-mutated PTC is cost effective. This cost-utility analysis is based on a hypothetical cohort of 40-year-old women with small PTC [2 cm, confined to the thyroid, node(-)]. We compared preoperative BRAF testing and TT+CND if BRAF-mutated or TT alone if BRAF-wild type, versus no testing with TT. This analysis took into account treatment costs and opportunity losses. Key variables were subjected to sensitivity analysis. Both approaches produced comparable outcomes, with costs of not testing being lower (-$801.51/patient). Preoperative BRAF testing carried an excess expense of $33.96 per quality-adjusted life-year per patient. Sensitivity analyses revealed that when BRAF positivity in the testing population decreases to 30%, or if the overall nonc...
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Papers by Arturo Gabriel Espinoza Garcia